Try a new battery
im on set 5 now, after 10 long years,
no battery made lasts that long.
none.
read the service manual, and do as it tells you.
power off , first
no line cord
and power off, next.
and then case open remove battery lugs first. or danger awaits.
remove the black negative wire first. from battery
first off, last on, is the rule for black wire. !!! red is next. and last.
Replacing batteries is really cost-effective replacing the unit is the best choice for a long-term solution although you can go on eBay and assess this yourself. Good luck
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